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Relation: subclass

direct-childrendocumentationgraph
WaterArea96A body which is made up predominantly of water, e.g. rivers, lakes, oceans, etc.^
Collection655Collections have members like Classes, but, unlike Classes, they have a position in space-tim...^
    RiverSystem.A RiverSystem comprises all the tributary streams and rivers (StreamWaterAreas) that drain alon...^

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